Add clear-line shortcode

functions.php

//* General Class Shortcode
function clearline_func() {
    return '<section class="clear-line"></section>';
}
add_shortcode( 'clear-line', 'clearline_func' );

style.css

/* Shortcodes */
.clear-line {
  border-bottom: 1px solid #ddd;
  clear: both;
  padding-top: 40px;
  margin-bottom: 40px;
	}